Microphone traverse system sound intensity XYZ (transmission loss system)
The Japanese standard for transmission loss is based on sound intensity measurements between a reverberation room and an anechoic room. Standards that apply are ISO15186, JIS A 1441-1:2007.
Sound transmission loss ( TL ) is the quantity which indicates the sound insulation performance of lightweight materials such as panels or wall structures. Applications are to determine the sound transmission loss of wall panels, doors, windows, automotive parts such as dashboards, facade panels etc.
To perform the measurements we have to place the material to be tested between 2 (independently built) rooms, a room with the sound source in it and a room where we will measure the receiving noise level. The sound transmission loss (TL) will be calculated from these values.
In the receiving room, the sound intensity level has to be measured close to the test material. Hereto the full surface has to be scanned. This could be done manually but it takes a lot of time and can introduce errors. A much better system is the fully automated traverse system which automatically moves the sound intensity probe (or single microphone) to the right position for the correct amount of time.
Here below is an example for the traverse system.
Type of model: floor standing type, 3 axes, 2 automated,
Limits traverse system:
- X-axis, 1200 mm (automatic)
- Y-axis, 1400 mm (automatic)
- Z-axis, 1000 mm (manually)
Total weight; less than 200 kg
Traverse system: stepping motor
Moving speed: 10 – 50 mm/second
Accuracy: +/- 1 mm